Edward William Lane, An Arabic-English Lexicon, ط

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5 تطيّر مِنْهُ ذ , (S, A, Msb, K,) and بِهِ, (S, K,) sometimes changed to اِطَّيَّرَ, (S, A, Msb,) as in the Kur xxvii. 48, the ت being incorporated into the ط, and this requiring a conjunctive ا that the word may begin with it [and not with a quiescent letter], (S,) inf. n. [or rather quasi-inf. n.] طِيَرَةٌ, the only instance of the kind except خِيَرَةٌ, which is the same in relation to تَخَيَّرَ, (IAth,) He augured evil from it; regarded it as an evil omen. (S, Msb, K.) The Arabs, when they desired to set about an affair, passed by the places where birds lay upon the ground, and roused them, in order to learn thence whether they should proceed or refrain: but the law forbade this. (Msb.) They augured evil from the croaking of the crow, and from the birds' going towards the left; and in like manner, from the motions of gazelles. (TA.) تَفَآءَلَ signifies the contr. of تطيّر. (TA.)